#ifndef NOOSE_HPP
#define NOOSE_HPP
#include "../headers/rope.hpp"

#include <string>

struct Exp;

enum class ExpKind { RANGE, OR, SEQ, ANY, NONE };

struct ExRange {
  bool negate = false;
  char start;
  char end;
};

struct OpOr {
  Exp *left;
  Exp *right;
};

struct OpSeq {
  Exp *left;
  Exp *right;
};

struct Exp {
  bool capture;
  ExpKind kind;
  union {
    OpOr *opor;
    OpSeq *opseq;
    std::vector<ExRange> ranges;
  };
  Exp() {
    capture = false;
    kind = ExpKind::NONE;
  }
};

struct Parser {
  std::string s;
  size_t i;
  Parser(std::string str) : s(str), i(0) {}
};

enum Op {
  // These jump around
  JMP = 0, // Jump to j.x
  FRK = 1, // Fork to j.x and j.y (with priority to x)
  // These consume 1 char from the input, if not then fail thread
  // (failuire of main thread is not successfull match)
  MCH = 2, // match with range object
  NMC = 3, // not match with range object
  ANY = 4, // Anything
  // Used to save offsets
  SVS = 5, // Start save for i cap group
  SVE = 6, // End save for i cap group
  // Match is successful if main thread reaches the end
  END = 7
};

struct Range { // use start == end to match a particular char
  char start;
  char end;
};

struct Inst {
  Op op;
  union {
    struct {
      Range *ranges;
      int len;
    } r;
    struct {
      int x, y;
    } j;
  };
  int idx;
};

Exp *regex_to_ast(std::string pattern);
Inst *compile_ast(Exp *root);
Inst *compile_regex(std::string pattern);
int next_match(Inst *prog, ByteIterator *it, uint32_t *saved);

#endif